Jetpack Compose：从上手到进阶再到高手

前言视频一楼pp中没有activity的时候的方法动一个透明的Activity，onCreate方法中显示tost，然后定时finish。

使用WindowManager来显示一个view，然后定时移除

先new一个TextView，给它设置背景与颜色、字号，使之符合你想要的toast，然后设置好LayoutParams，把textView add到windowmanager上，然后定时移除。

private void showToast(Context context){

        final WindowManager wManager=(WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

        final TextView textView=new TextView(context);

        textView.setBackgroundResource(R.drawable.shape_bg_ball);

        textView.setText(context.getString(R.string.toClipboard));

        textView.setPadding(dp2Px(10,context),dp2Px(5,context),dp2Px(10,context),dp2Px(5,context));

        int screenHeigth = wManager.getDefaultDisplay().getHeight();

        int mStatusBarHeight = dp2Px(25, context);

        WindowManager.LayoutParams mParamsToast = new WindowManager.LayoutParams();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

            if (Build.VERSION.SDK_INT > 23) {

                    //在android7.1以上系统需要使用TYPE_PHONE类型 配合运行时权限

                mParamsToast.type = WindowManager.LayoutParams.TYPE_PHONE;

            } else {

                mParamsToast.type = WindowManager.LayoutParams.TYPE_TOAST;

            }

        } else {

            mParamsToast.type = WindowManager.LayoutParams.TYPE_PHONE;

        }

       

        mParamsToast.format = PixelFormat.RGBA_8888;

        mParamsToast.gravity = Gravity.LEFT | Gravity.TOP;

        mParamsToast.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

        int defaultY =screenHeigth- ((screenHeigth - mStatusBarHeight) / 2) / 3;

        mParamsToast.x = wManager.getDefaultDisplay().getWidth()/2- Tools.getViewWidth(textView)/2;

        mParamsToast.y = defaultY;

        mParamsToast.alpha = 1;

        mParamsToast.width = WindowManager.LayoutParams.WRAP_CONTENT;

        mParamsToast.height = WindowManager.LayoutParams.WRAP_CONTENT;

        wManager.addView(textView, mParamsToast);

        new Handler().postDelayed(()->

                wManager.removeViewImmediate(textView),500);

    }